John booth



J. BOOTH.

SLIDE VALVE.

(No Model.)

No. 355,433. Patented 33.11-3133?.

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JOHN BOOTH, OE- INDIANAPOLIS, INDIANA.

SLI DE-VALVE.

SPECIFICATION forming part of Letters Patent No. 355,433, dated January4, 1887.

Application filed September 15, 1886. Serial No. 213,631. (No model.)

To all whom, it may concern:

Be it known that I, JOHN BOOTH, a resident' of Indianapolis, Marioncounty, Indiana, have made certain new and useful Improvements inSlide-Valves, a description of which is set forth in the followingspecification, reference being made to the accompanying drawings, in theseveral figures of which like letters represent like parts.

My invention relates to the construction of slide-valves forsteam-engines; and my object is to relieve the valve from the frictionconsequent on the diiference of pressure between the back of the valveand the cavity of the exhaust-passage, and is an improvement upon thedevice for which Letters Patent No. 339, 7 34 were issued to me on the13th of April, 1886.

In the drawings,- Figure 1 represents a top view of the valve andsteam-chest with 'the cover removed. Fig. 2 is a cross-section through'the center on the line x x, Fig. 1. Fig. 3 is a front end view of thevalve. Fig. 4 is a cross-section on the linea z, Fig. 3. Fig. 5 is asection on the line 7c k, Fig. 1, and Fig. Gis a section on the line ua, Fig. `1.A

In detail, 'u is the slide-valve, and eg is an equalizing frame or ring,which rests in a groove formed in the sides of the valve.

p is the packing beneath the equalizingframe and resting upon a packingframe or ring, pf, which is provided with legs Z, as shown in Fig. 5.These legs rest directly upon the bottom of the groove, sustaining thepacking-frame some distance above it, to allow the steam to enterthrough the ports o andunder the packing-frame.

,ec is the exhaust-cavity of the valve, which is enlarged, as shown inFig. 5, to give as much room as possible for the steam to escape.

ep is the exhaust-port in the cylinder below, and sp are thesteam-ports.

ch represents the -steam-chest, of which t is the top, and cy is thecylinder below. The valve o is surrounded by a yoke, y, to which isconnected the valve-rodr, through the gland gland boxing b, in the samemanner as described in my former patent.

rIhe exhaust-cavity extends through the whole depth ofthe valve, and thepackinggroove g is formed in the walls of the valve,

' to the downward-pressed surface of the valve,

tus; or metallic packing may be used, if desired, and the pressure ofthe steam from below, acting under the packing-frame and compressingthis packing material, will 4force it 65 upward against theequalizing-frame eq, and this latter is pressed outward against thesteam-chest cover, thereby making the upperpressed surface of theequalizing-frame equal less the area of the space between thepacking-groove and the Outside walls of the valve, thus making. asufficient pressure upon the valve to secure its adherence to its seat.

The packing-frame may be made of any desired shape, provided the 'grooveis made of corresponding shape, and it may be used in combination withthe ordinary slide-valve, -if

desired. l

My presentv improvement consists in dispensing with the elliptic springshown in my former Letters Patent, and in providing 'the packing-framewith legs which supp-ort it in the Y groove above the steam-ports,making use of the steam itself to raise the parts, as hereinbeforedescribed.

What I claim, and desire to secure by Letters Patent herein, is thefollowing:

1. A slide-valve of a steam-engine provided with grooves in the wallsbetween the Outside and the exhaust-cavity, a top frame or ring restingin such. groove upon any suitable packing material, in combination witha packing-ring, also resting in such groove and supported by suitablelegs above the steam-ports which admit the steam, all combinedsubstantially as described. i

2. The steam-chest ch, having the top t, th cylinder cy, havingsteam-ports sp, exhaustport ep, the valve 0, having the enlarged exrooThe space between these is filled by 6o Y any suitable packingmaterial-such as asbespr hansb-port ec, the groove g, formed in thewalls In witness whereof I have hereunto set my okt; such valve, withsteam-vents o connected hand this 10th day of September, 1886. terewith, the equalizing-fraine eg, resting upon the packing p, supportedby the packing- JOHN BOOTH' 5 frame pf, having legs Z, all containedWithin Vitnesses:

such groove, all combined substantially as C. I?. JACOBS, shown anddescribed. HATTIE MURRY.

